ECD SYSTEM, Diagnostic DTC:P0489, P0490

DTC Code DTC Name
P0489 Exhaust Gas Recirculation Control Circuit Low
P0490 Exhaust Gas Recirculation Control Circuit High

DESCRIPTION

The EGR actuator is operated by the ECM and opens and closes the EGR valve using gears. The opening angle of the EGR valve is detected by the EGR position sensor, which is mounted on the EGR body.

P0489
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Idle the engine for 5 seconds or more

The EGR actuator current is below 0.5 A for 2.0 seconds during EGR valve operation.

(1 trip detection logic).

  • Open or short in EGR valve circuit

  • EGR valve assembly

  • ECM
P0490
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Idle the engine for 5 seconds or more

An EGR actuator current of 8 A or higher due to a mechanical malfunction, or a Hall IC temperature of 150 to 160°C (302 to 320°F) or higher is detected.

(1 trip detection logic):

  • Open or short in EGR valve circuit

  • EGR valve assembly

  • ECM
Related Data List
DTC No. Data List
P0489

  • Actual EGR Valve Pos.

  • Target EGR Valve Pos.
P0490

WIRING DIAGRAM

Refer to DTC P0400 Click here.

INSPECTION PROCEDURE

Note

After replacing the ECM, the new ECM needs registration Click here and initialization Click here.

PROCEDURE


  1. INSPECT EGR VALVE ASSEMBLY


    1. Inspect the electric EGR valve assembly Click here.


    NG

    REPLACE EGR VALVE ASSEMBLY Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (EGR VALVE ASSEMBLY - ECM)


    1. A003BSZE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Electric EGR Valve Assembly)
      *2

      Front view of wire harness connector

      (to ECM)

      Disconnect the EGR valve assembly connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      z15-5 (M+) - B39-86 (EGM+) Always Below 1 Ω
      z15-1 (M-) - B39-85 (EGM-) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      z15-5 (M+) or B39-86 (EGM+) - Body ground Always 10 kΩ or higher

    4. Reconnect the EGR valve assembly connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  3. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  4. REPLACE EGR VALVE ASSEMBLY


    1. Replace the EGR valve assembly Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  5. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.


    NEXT

  6. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the intelligent tester to the DLC3.

    2. Clear the DTCs Click here.

    3. Turn the ignition switch off for 30 seconds or more.

    4. Start the engine.

    5. Idle the engine for 5 seconds or more

    6. Enter the following menus: Powertrain / Engine and ECT / DTC.

    7. Confirm that the DTC is not output again.


    NEXT

    END